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Calculating GPM

Hello all. New to the site, been in the trade about 15 years. Got a new employer, and we do work on chillers ( air cooled screw, scroll, and recip). How do you know you have proper water flow (gpms) through a chiller?How do you know what it's supposed to be? I appreciate feed back. I tried to do a search on here, but came up empty.

The iom manuals of the machine will tell you the design gpm, minimum and maximum for that particular machine. At the machine using the same gauge to measure supply and return pressure with the chiller at full load, you apply this formula: